Improvement in electric clocks



2 Sheets--Sheet I. D. F. SWEET.

Electric-Clock. No, 169,057, Patented 0ct.19,1875.

WITNESSES IJV'VEJVTOR By 0 mm W C 1C x? I or'ney HOGRAPHER. WASHINGTON.p C.

m PETERS. PHOTO-Ll 2 Sheets--Sheet 2. n. r. swan.

Electric-Cluck. N0.169,057, Patented Oct.19,187 5.

UNTTED STATES PATENT OFFICE.

DANIEL F. SWEET, OF HASTINGS, MICHIGAN, ASSIGNOR OF ONE-HALF HIS RIGHTTO HOMER MOUL AND J. LEE REED, OF SAME PLACE.

IMPROVEMENT lN ELECTRIC CLOCKS.

Specification forming part of Letters Patent N 0. 169.057, dated October19, 1875; application filed 1 September 14, 1576.

To all whom it may concern:

Be it known that I, DANIEL F. SWEET, of Hastings, in the county of Barryand in the State of Michigan, have invented certain new and usefulImprovements in Electric Clocks; and do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accom panyin g drawings, and to the letters ofreference marked thereon, making apart of this specification.

The nature of my invention consists in the construction and arrangementof an electric clock, as will be hereinaftermore fully setforth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawings, in whichFigure l is a front elevation of my electric clock. Fig. 2 is a rearelevation of the same. Fig.3 is a plan view. Figs. 4, 5, and 6 are sideViews of the only three wheels used in my clock.

A represents the frame of the clock, in a suitable part of which is ashaft, to, carrying upon its front end the second-hand B. ()n the shafta is a sleeve, b, which carries on its frontend the minute'hand B ,andon the sleeve bis another sleeve, 01, which carries the hourhand B onits front end. 0 C and U are the three operating-wheels, secured,respectively, upon the shaft a and sleeves b d within the frame A. Thewheel 0 is formed with sixty teeth, at equal distances apart, on itscircnm ference. The wheel (3 has also sixty teeth, and the wheel 0 hastwenty-four teeth. The wheel C is operated by a pawl, h, attached to arocking lever, I), so as to turn said wheel the distance of one tooth ateach stroke of the lever. ()n the side of the wheel O is a cam,f, which,once during each revolution of the said wheel, operates on an arm, k,hung upon a shaft, 0, in the top of the frame. To this arm is pivoted asecond pawl, h which operates on the second wheel 0 so that for eachrevolution of the first wheel (1 the second wheel 0 is turned thedistance ofone of its teeth.

The first wheel 0 being set for seconds, the second wheel b will,through the hand B indicate minutes. In like manner the third pawl itand two cams, ff, on the side of the wheel 0 be turned the distance oftwo of its teeth for every revolution of said wheel 0 The hand Bconnected to the wheel O will, therefore,be moved everyhalfihour therequired distance. By having four cams on the wheel 0 and doubling thenumber of teeth on the wheel 0 the hour-hand will be moved everyquarter-hour the proper distance. As soon as the pawls It [t haveoperatedtbeir respective wheels they are brought back to their properposition by means of springs '21 01, applied to the arms k is. To thelever D is attached the ordinary armature E, to be attracted by theelectro-magnets Gr, and the upper end of said lever is forked, as shownin Fig. .4, to receive a pin, m, projecting from the ordinaryescapement-wheel H, which is attached to a shaft, n, in the frame, andwhich shaft has the usual hair-spring I connected to it. In the sameline as the axis of the rocking lever B is pivoted an L-shaped arm, .I,the horizontal part of which is below a set-screw,p, in a stand, K. Inthe vertical part of the arm J is fastened a fiat spring, 5, whichextends up along the side of the armature-lever I), so that the balancewheel pin m will strike the end of said sprin The magnets G areconnected with one pole of the battery, and the stand K with the otherpole. The magnet is further connected with the metallic stand in whichthe lever l) and arm J are pivoted. \Vhenever the arm J is in contactwith the set screw 19 the electric cit unit is closed, and as soon asthe arm gets away from said setscrew the circuit is broken.

In operation, when the circuit is closed, the magnets at once draw thearnn-tture lever D toward them, whereby the first wheel 0 is turned thedistance ofone ofits teeth. At the same time the crotched end of thelever, by the pin m the-rein, gives an impetus to the balance-wheel inone direction, and, while turning in that direction, the pin in issuddenly released from the spring 8, which spring, in its recoil, aidedby the weight of the arm J. at once breaks the circuit. The returnmovement of the balance-wheel, caused by the recoil of the hair-spring,moves, by meansof the pin in, the lever I) away from the magnet, so asto set wheel will, by means of an arm, is, and l the pawl h. on the nexttooth ot the wheel 0,

and the pin m will again pass by the upper end of the spring 8. As thebalancewheel again returns, the pin m, entering the crotch of the leverD, carries the spring 8 forward until the arm J strikes the screw p,when the circuit is closed, and the magnets instantaneously attract thearmature E, giving a renewed impetus to the balance-wheel. The wheels (3G O are held from any back motion by means of pawls t, suitably arrangedfor that purpose. Having thus fully described my invention, what I claimas new, and desire to secure by Letters Patent, is-

In an electric clock, the combination of the DANIEL F. SWEET. Witnesses:

O. L. EVERT, JOHN SMITH.

